package dd.lo.chapter10;

import dd.lo.util.ImageUtils;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.scene.text.Text;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import java.io.ByteArrayInputStream;
import java.io.File;

/**
 * Smoothing代码样例
 */
public class Example4 extends Application {

    private enum Mode {
        BLUR,
        BOX_FILTER,
        MEDIAN_FILTER,
        GAUSSIAN_FILTER,
        BILATERAL_FILTER, //edge-preserving smoothing
        ;
    }

    private static final int DEFAULT_WIDTH = 1080;
    private static final int DEFAULT_HEIGHT = 768;

    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        launch(args);
    }

    private ImageView imageView;

    private Mat srcImg;

    private int modeIdx = 0;

    private Mode mode = Mode.BLUR;

    private int kSize = 5;

    private void smoothing(Mat srcImg) {
        Task<Void> task = new Task<Void>() {
            @Override
            protected Void call() {
                Mat dst = Mat.zeros(srcImg.size(), CvType.CV_8U);
                if (mode == Mode.BLUR) {
                    Imgproc.blur(srcImg, dst, new Size(kSize, kSize), new Point(-1, -1), Core.BORDER_DEFAULT);
                } else if (mode == Mode.BOX_FILTER) {
                    Imgproc.boxFilter(srcImg, dst, 3, new Size(kSize, kSize));
                } else if (mode == Mode.MEDIAN_FILTER) {
                    Imgproc.medianBlur(srcImg, dst, kSize);
                } else if (mode == Mode.GAUSSIAN_FILTER) {
                    Imgproc.GaussianBlur(srcImg, dst, new Size(kSize, kSize), 0.0);
                } else {
                    Imgproc.bilateralFilter(srcImg, dst, kSize, 1.0, 1.0);
                }
                //调整图片大小以用于展示
                ImageUtils.fitImgSize(dst, DEFAULT_WIDTH, DEFAULT_HEIGHT);
                MatOfByte buffer = new MatOfByte();
                Imgcodecs.imencode(".jpeg", dst, buffer);
                Platform.runLater(() -> imageView.setImage(new Image(new ByteArrayInputStream(buffer.toArray()))));
                return null;
            }
        };
        new Thread(task).start();
    }

    @Override
    public void start(Stage stage) {
        //File chooser
        Button imageChooser = new Button("选择图片");
        imageChooser.setOnMouseClicked(e -> {
            FileChooser fileChooser = new FileChooser();
            fileChooser.setTitle("请选择图片");
            fileChooser.setInitialDirectory(new File(System.getProperty("user.home") + "/Downloads")
            );
            fileChooser.getExtensionFilters().addAll(
//                    new FileChooser.ExtensionFilter("All Images", "*.*"),
                    new FileChooser.ExtensionFilter("JPEG", "*.jpeg"),
                    new FileChooser.ExtensionFilter("WEBP", "*.webp"),
                    new FileChooser.ExtensionFilter("PNG", "*.png"),
                    new FileChooser.ExtensionFilter("JPG", "*.jpg"),
                    new FileChooser.ExtensionFilter("GIF", "*.gif"),
                    new FileChooser.ExtensionFilter("BMP", "*.bmp")
            );
            File imgFile = fileChooser.showOpenDialog(stage);
            if (null == imgFile) {
                System.out.println("用户取消选中文件");
                return;
            }
            //读取一张图片
            srcImg = Imgcodecs.imread(imgFile.getAbsolutePath(), Imgcodecs.IMREAD_UNCHANGED);
            if (srcImg.empty()) {
                throw new RuntimeException("图片读取失败");
            }
            srcImg.convertTo(srcImg, CvType.CV_8U);
            smoothing(srcImg);
        });
        //Mode indicator
        Text modeText = new Text("当前模式：" + mode);
        Button prevModeButton = new Button("上一个模式");
        prevModeButton.setOnMouseClicked(e -> {
            --modeIdx;
            modeIdx = (Mode.values().length + modeIdx) % Mode.values().length;
            mode = Mode.values()[modeIdx];
            modeText.setText("当前模式：" + mode);
            smoothing(srcImg);
        });
        Button nextModeButton = new Button("下一个模式");
        nextModeButton.setOnMouseClicked(e -> {
            ++modeIdx;
            modeIdx = modeIdx % Mode.values().length;
            mode = Mode.values()[modeIdx];
            modeText.setText("当前模式：" + mode);
            smoothing(srcImg);
        });
        //k size indicator
        Text kSizeText = new Text("k = " + kSize);
        Button minuxButton = new Button("-2");
        minuxButton.setOnMouseClicked(e -> {
            kSize -= 2;
            if (kSize < 1) kSize = 1;
            kSizeText.setText("k = " + kSize);
            smoothing(srcImg);
        });
        Button addButton = new Button("+2");
        addButton.setOnMouseClicked(e -> {
            kSize += 2;
            if (kSize > 21) kSize = 21;
            kSizeText.setText("k = " + kSize);
            smoothing(srcImg);
        });
        FlowPane bottomControl = new FlowPane();
        bottomControl.getChildren().addAll(imageChooser, prevModeButton, modeText, nextModeButton, minuxButton, kSizeText, addButton);
        bottomControl.setPrefHeight(50);
        BorderPane root = new BorderPane();
        imageView = new ImageView();
        root.setCenter(imageView);
        root.setBottom(bottomControl);
        Scene scene = new Scene(root, DEFAULT_WIDTH, DEFAULT_HEIGHT + 50);
        stage.setScene(scene);
        stage.setTitle("Example4-Smoothing");
        stage.setResizable(false);
        stage.show();
    }
}
